Vulcanizing apparatus.



AQI. GOGSWBLL & J. W. PUGKBTT.

VULGANIZING APPARATUS. APPLIUATION rum) aim. an, 1901.

WITNESSES 1 INVENTOHS AsA F, Cooswzu,

. Jomarww W. Pucmsrr,

I By M I v A7TOHNEYS' Patented June 1, 1909.

Z SHEETS-SHEET 1.

A. P. GUGSW ELL & J. W. BUGKETT, VULGANIZING APPARATUS. APPLIOATION P-ILED SEPT. 21, 1907.

923,772. Patented June 1,1909.

2 SHEETS-SHEET 2.

WITNESSES /NVENTOR3 Asa F. CoaswELL I JONATHAN W. "Pucmsrr,

Y I B 44/ V ATTORNEYS v and it consists in the novel construction and .arran ement of parts in whlch the vulcanizer' UNITED STATES, PATENT OFFICE.

ASA FERRIS COGSWELL, OFPRETTY PRAIRIE, KANSAS, AND JONATHAN WESLEY PUGKETT,

' OF GENEVA, NEBRASKA.

VULCANIZING APPARATUS.

Specification of Letters Patent.

Patented June 1, 1909.

Application filed. September 21, 1907. Serial No. 393,943.

- Geneva, in the county of Fillmore and State of Nebraska, have invented a new and useful Improvement in Vulcanizing Apparatus, of which the following is a specification.

In the manufacture of artificial dentures requirin the use of rubber and gutta peroha, the usua method is to bring the vulcanizer u to the required temperature, which takes a out thirty minutes, and then hold it at that temperature without variation for one hour, then slowly cool the vulcanizer and open it; and any variation of temperature during this one hour results in imperfect vulcanization, causing the product to be too hard, or too soft, or porous from air bubbles, and often warping the plate and causing a misfit. This requires a very careful and prolon ed attention from the dentist and a very arge ercentage of the vulcanite dentures are il -fit ting from this one cause, for the reason that the average dentist has not the time or inclination to sit and watch a vulcanizer, so as to keep the heat erfectly regulated for the required time. ur vulcanizin furnace is designed to overcome these di culties, and to automatically control and regulate the process without attention from the dentist when rought to the proper temperature automatically closes a sectional oven about thesame, so as to maintain the even and prolonged heat and at the same time shuts oh? the supply of fuel-oil, gas, or heating agency, thus savin fuel, saving the dentists time, avoiding a1 mistakes, insuring uniformity in every case, and doing the work surely and perfectly without any attention from the dentist.

Figure 1 is a perspective view from the 1 front with the oven partly o ened. Fig. 2 is an end view of the shut-o devices for the burner. Fig. 3 is a vertical central longitudinal section. Figs. 4 and 5 are details of the thermostat prop for holding the oven sections 0 en.

In t e drawing, 11 is the stove havin a burner 16. This may be any kind 0 a heater, such asa gas or gasolene burner, or

asbestos or other fire an electric heater. Said stove has a flat table surface supported upon legs and from the backend of the stove there rises an upright standard 17 which is made of a metal pipe of suitable'size to allow the supply plpe which conducts fuel to the burner to ass through said standard, from the gaso ene tank 1 mounted on the to of said standard. On the standard 17 'is adgustably supported an of]?- setting vulcanizer support 8, consisting of a circular ring on the end of an .arm attached to a collar embracing the standard 17and rigidly connected thereto by a set screw. Upon the standard 17 is also supgported two semi-cylindrical oven sections A connected by hin es 3 to the standard and arranged when 0 osed together to form a closed oven around the vulcanizer within, or be 0 ened as in Fig.1, the oven bein thus divide into two separable halves. his oven-may, occupy a osition directly above the burner, or

it may e swung to either sideof the same to allow the stove to be used for other heating purposes when it is not in use for heating the oven the burner or heating device being wholly external to and outside of the overr. The oven is made vertically adjustable on the standard and its position is regulated a sliding collar 4 with set screws tohol' cl the oven hinges at the proper height. Said oven is made of an outside metalicas-lngi5, an

inside lining 6, and a packing orfilliiig 7 of proof and H'OIDEGOH- ducting material for retaining the heat the required time. The hinges 3 of the ovenare provided with a coil spring 3 of sufficient strength to cause the oven sections to swin tightly together when not positively hel' o n.

The vulcanizer arm 8 holds the vulcanizer V directly over the burner of the stoveand in a position suspended'near the center of the oven, as seen in Fig. 3, when the oven is closed, the rear meeting edges of the oven sections being grooved t0- fit around the said arm so as to allow it to pass from the-exterior to the interior of the oven. The oven is designed to be set as close to the burner asconvenient to clear the burner when the oven is closed, and the two halves of the oven have on their lower ends rollers 9 that cooperate with a cut off device for the fuel which i'sdescribed as follows.

A valve stem 18 controls the flow otfgas'olene from the tank and has on its outer end a weighted and rigidly attached shut ofl lever 12 and at a pomt beneath the stove top has a rigid ratchet wheel 13. yoke-shape detent 14 is curved around the ratchet wheel and is strained u Wardly by a spring 15 so as to hold 'the toot of the detent against the ratchet wheel with the weighted arm 12 in elevated position. The yoke portion of the detent passes through a slot in the stove table and is'directly in the path of the rollers 9 on the oven section, so that when the oven sections swing to the closed position, the

*rollers, acting on this yoke as a resser foot,

depress it and remove the toot of the detent from the ratchet, leaving the ratchet free to turn from the ravity of the weighted arm 12, which, in fa 'ng, shuts off the sup- .ply of fuel by turning the valve stem and closing the valve. in the supply pipe. A valve 2 near the tank serves to out 0H the fiow entirely.

The vulcanizer Vused in the oven is provided on its lid with guide sockets 19, 19

Which hold the two sections 20, 21 of a telesco ic pro One section, 20, is a fiat tube an the ot er, 21, is a fiat bar passing freely into the tube. This telescopic prop lies flat on the top of the vulcanizer lid and extends across the oven in position-to come in contact with the inner walls ofthe two halves of the oven and when extended serves to prop said halvesopen just enough to admit the full heat of the burner to come in contact with the bottom of the vulcanizer as seen in Figs. 4 and 5. This osition of parts is maintainedup to a requlsite temperature by a fusible plug 22 which is inserted in a hole in the flat tube 20 in front of the fiat bar 21, so

that the latter cannot move endwise into the tube, butwhen the requisite temperature has been reached this fusible plug melts or softens and then the spring hinges of the oven sections cause the telescopic prop to slide up and shorten and the oven sections then close tightly around the heated vulcanizer, maintaming its temperature through the requisite period of time. When the half sections of the oven come together the rollers 9 depress the yoke 14 to close the oil feed and a snap catch 23 looks the halves A B of the outer casing together in closed position.

To the top of each oven section is ivotally connected the outer ends of a knuekl jointed brace 10 which, when straightened out, will hold the two sections of the oven open in convement position while the vulcanizer is bein placed in osition and the automatic shutoffis being a justed, and while the vulcanizeris required of the dentist is to get the vulcanizer in position, extend the telescopic prop, placethe fusible lug in it, which acts as a thermostat, then ight the fire and turn it on strong enough to run up the required temperature in any time from five to thirty minutes, no matter how fast or slow, and as soon as the fire is lighted the dentist is through. When the heat reaches the proper temperature the fusible plug softens and the oven closes and simultaneously extinguishes the flame of the burner.

We claim 1. A vulcanizing furnace comprising an oven made in two hinged and separable parts, a heating device external to the oven and'devices for automatically closing the oven when a predetermined temperature is reached.

2. A vulcanizing furnace comprising an. oven made in two hinged and separable parts, a heating device external to the oven,

two equal and simultaneously moving sections hinged about a vertical axis.

5. A vulcanizing furnace comprising an oven made in two separable parts, a thermostat rop for holding the oven open, a spring for c osing the same, a heating device external to the oven and means for cutting off the heat supply by the closing of the oven.

6. A furnace comprising a heating device, a vertical standard, a divided oven arranged above the heating devices to swing upon the vertical standard, a supporting arm attached to the standard and bearin a vulcanizer support, a vulcanizer mounte thereon and havmg a thermostat prop to hold the oven sections open and a spring for closing .the oven.

7. A furnace comprising a heating device, a vertical standard, a divided oven arranged above the heating devices to swing upon the its detent is released.

above the heating device, a presser foot arof nonconducting material to retain the heat ranged below and acted upon by tihe oven after the fire is extinguished.

sections and having a detent a va ve stem with ratchet wheel restrained by said detent, gfiig w%g z% ggb and means for turning the valve stem when I V Witnesses as to signature of Cog-swell:

JONATHAN P. GRABER, JOSEPH O. HANEs.

Witnesses as to signature of Puckett:

W. E. PROPST, G. D. PENDELL.

9. A furnace comprising a burner, having an upright tubular standard, and having its fuel supply pipe extend down through the tubular standard, and a twoart oven hinged about the upright standar the oven being I 

